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Safety of Methanesulfonic Acid to Lower PH in Hot Tub

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CanadianSpaTech:
Not saying it's Virus or Covid 19 related. So the day before you "cleaned" the spa. Did you use a plumbing line cleaner or just drain it, wipe down the surface and refill it? If you have not used a line disinfectant I strongly urge you to do so.

As for the high chlorine level yes is could cause lung "burn" and likely what has happened in your case. When you are sitting in the spa steam coming up for the water goes right to the nose. I always advise to my customers when they open the cover prior to use to step back for a few seconds to allow the spa to "off gas". Between the top of the water and the underside of the cover Ozone and chemical fumes will sit in that area and will be released when the cover is opened. I get a lot of customers that will add product to the water and then close the lid and walk away. Always leave the cover open for a minimum full 15 minute cycle before closing to allow off gassing. This will also minimize burning the underside of the cover. If you have added caustic chemicals like chlorine allow several hours if not a day before using to prevent getting a nose full. JMO

Hope you get past this quickly and are able to enjoy your spa going forward. Regards CST

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